Company founders Ben Cohen and Jerry Greenfield serve their Ben and Jerry’s ice-cream before a campaign rally with Democratic 2020 U.S. presidential candidate and U.S. Senator Bernie Sanders (I-VT) in Dover, New Hampshire, U.S. September 1, 2019.

Company founders Ben Cohen (L) and Jerry Greenfield pose for a selfie while serving their Ben and Jerry’s ice-cream before a campaign rally with Democratic 2020 U.S. presidential candidate and U.S. Senator Bernie Sanders (I-VT) in Dover, New Hampshire, U.S. September 1, 2019.

Security checks audience members as they arrive for a campaign rally with Democratic 2020 U.S. presidential candidate and U.S. Senator Bernie Sanders (I-VT) in Dover, New Hampshire, U.S. September 1, 2019.

Company founders Ben Cohen and Jerry Greenfield serve their Ben and Jerry’s ice-cream before a campaign rally with Democratic 2020 U.S. presidential candidate and U.S. Senator Bernie Sanders (I-VT) in Dover, New Hampshire, U.S. September 1, 2019.

An audience member with a U.S. flag scarf dances before a campaign rally with Democratic 2020 U.S. presidential candidate and U.S. Senator Bernie Sanders (I-VT) in Dover, New Hampshire, U.S. September 1, 2019.

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Democratic 2020 U.S. presidential candidate and U.S. Senator Bernie Sanders (I-VT) speaks at a campaign rally in Dover, New Hampshire, U.S. September 1, 2019.

REUTERS/Brian Snyder

Company founders Ben Cohen and Jerry Greenfield serve their Ben and Jerry’s ice-cream before a campaign rally with Democratic 2020 U.S. presidential candidate and U.S. Senator Bernie Sanders (I-VT) in Dover, New Hampshire, U.S. September 1, 2019.

REUTERS/Brian Snyder

Audience members arrive for a campaign rally with Democratic 2020 U.S. presidential candidate and U.S. Senator Bernie Sanders (I-VT) in Dover, New Hampshire, U.S. September 1, 2019.

REUTERS/Brian Snyder

Company founders Ben Cohen (L) and Jerry Greenfield pose for a selfie while serving their Ben and Jerry’s ice-cream before a campaign rally with Democratic 2020 U.S. presidential candidate and U.S. Senator Bernie Sanders (I-VT) in Dover, New Hampshire, U.S. September 1, 2019.

REUTERS/Brian Snyder

Security checks audience members as they arrive for a campaign rally with Democratic 2020 U.S. presidential candidate and U.S. Senator Bernie Sanders (I-VT) in Dover, New Hampshire, U.S. September 1, 2019.

REUTERS/Brian Snyder

Democratic 2020 U.S. presidential candidate and U.S. Senator Bernie Sanders (I-VT) poses for a photograph with a voter at a campaign rally in Dover, New Hampshire, U.S. September 1, 2019.

REUTERS/Brian Snyder

Company founders Ben Cohen and Jerry Greenfield serve their Ben and Jerry’s ice-cream before a campaign rally with Democratic 2020 U.S. presidential candidate and U.S. Senator Bernie Sanders (I-VT) in Dover, New Hampshire, U.S. September 1, 2019.

REUTERS/Brian Snyder

Audience members listen as Democratic 2020 U.S. presidential candidate and U.S. Senator Bernie Sanders (I-VT) speaks at a campaign rally in Dover, New Hampshire, U.S. September 1, 2019.

REUTERS/Brian Snyder

Audience members listen as Democratic 2020 U.S. presidential candidate and U.S. Senator Bernie Sanders (I-VT) speaks at a campaign rally in Dover, New Hampshire, U.S. September 1, 2019.

REUTERS/Brian Snyder

A campaign volunteer holds a doll of Democratic 2020 U.S. presidential candidate and U.S. Senator Bernie Sanders (I-VT) at a campaign rally in Dover, New Hampshire, U.S., September 1, 2019.

REUTERS/Brian Snyder

An audience member with a U.S. flag scarf dances before a campaign rally with Democratic 2020 U.S. presidential candidate and U.S. Senator Bernie Sanders (I-VT) in Dover, New Hampshire, U.S. September 1, 2019.

REUTERS/Brian Snyder

Democratic 2020 U.S. presidential candidate and U.S. Senator Bernie Sanders (I-VT) speaks at a campaign rally in Dover, New Hampshire, U.S. September 1, 2019.

REUTERS/Brian Snyder

Democratic 2020 U.S. presidential candidate and U.S. Senator Bernie Sanders (I-VT) poses for a photograph with a voter at a campaign rally in Dover, New Hampshire, U.S. September 1, 2019.

REUTERS/Brian Snyder

Democratic 2020 U.S. presidential candidate and U.S. Senator Bernie Sanders (I-VT) poses for a photograph with a voter at a campaign rally in Dover, New Hampshire, U.S. September 1, 2019.